Аннотация:Preservation of carotene for balancing the ration of animals in winter is important at the current time. It is known that drying is the most common way of preparing food for long-term storage. Elimination of moisture in the material inhibits oxidation of nutrients, development of pathogenic microflora, deterioration of the organoleptic properties of the product, and significantly reduces its technological volume. The process of drying to the conditioning humidity is quite long and energy-intensive, since the vast majority of useful substances of plant tissues are characterized by low thermal stability. To intensify the process of drying the vegetative mass allows the use of microwave radiation. The aim of the study is the mathematical description of microwave-vacuum drying of vegetative plant mass. The study was performed on the experimental setup of the waveguide type with increased intensity of exposure. The physical model of the process of dehydration with the addition of the parameters of the emitter of microwave energy and dielectric properties of dissipative material inside the drying chamber were considered. The mathematical model includes the system of equation changes in the physical and dielectric properties of the product in the steady state dehumidification. Implementation of mathematical models in the computational environment, such as MathCAD, allows to calculate the modes of equipment, depending on the varying properties of the dried product. Ultimately, the research will help design the installation of microwave drying with better performance and wide application.